--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/nkern/nkerns.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,411 @@
+// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// e32\nkern\nkerns.cpp
+// 
+//
+
+// NThreadBase member data
+#define __INCLUDE_NTHREADBASE_DEFINES__
+
+#include <e32cmn.h>
+#include <e32cmn_private.h>
+#include "nk_priv.h"
+
+extern "C" void ExcFault(TAny*);
+
+/******************************************************************************
+ * Thread
+ ******************************************************************************/
+
+void InvalidExec()
+	{
+	FAULT();
+	}
+
+static const SFastExecTable DefaultFastExecTable={0,{0}};
+static const SSlowExecTable DefaultSlowExecTable={0,(TLinAddr)InvalidExec,0,{{0,0}}};
+
+const SNThreadHandlers NThread_Default_Handlers =
+	{
+	NTHREAD_DEFAULT_EXIT_HANDLER,
+	NTHREAD_DEFAULT_STATE_HANDLER,
+	NTHREAD_DEFAULT_EXCEPTION_HANDLER,
+	NTHREAD_DEFAULT_TIMEOUT_HANDLER
+	};
+
+/** Create a fast mutex
+
+	@publishedPartner
+	@released
+*/
+EXPORT_C NFastMutex::NFastMutex()
+	: iHoldingThread(0), iWaiting(0)
+	{
+	}
+
+/** Create a spin lock
+
+	@internalComponent
+*/
+EXPORT_C TSpinLock::TSpinLock(TUint)
+	: iLock(0)
+	{
+	}
+
+/** Create a R/W spin lock
+
+	@internalComponent
+*/
+EXPORT_C TRWSpinLock::TRWSpinLock(TUint)
+	: iLock(0)
+	{
+	}
+
+NThreadBase::NThreadBase()
+	{
+	// from TPriListLink
+	iPriority = 0;
+	iSpare1 = 0;
+	iSpare2 = 0;
+	iSpare3 = 0;
+
+	iRequestSemaphore.iOwningThread=(NThreadBase*)this;
+	new (&iTimer) NTimer(TimerExpired,this);
+	iRequestSemaphore.iOwningThread = this;
+
+	iHeldFastMutex = 0;
+	iWaitFastMutex = 0;
+	iAddressSpace = 0;
+	iTime = 0;
+	iTimeslice = 0;
+	iWaitObj = 0;
+	iSuspendCount = 0;
+	iCsCount = 0;
+	iCsFunction = 0;
+	iReturnValue = 0;	
+	iStackBase = 0;
+	iStackSize = 0;
+	iHandlers = 0;
+	iFastExecTable = 0;
+	iSlowExecTable = 0;
+	iSavedSP = 0;
+	iExtraContext = 0;
+	iExtraContextSize = 0;
+	iLastStartTime = 0;
+	iTotalCpuTime = 0;
+	iTag = 0;
+	iVemsData = 0;
+	iUserModeCallbacks = 0;
+	iSpare7 = 0;
+	iSpare8 = 0;
+	}
+
+TInt NThreadBase::Create(SNThreadCreateInfo& aInfo, TBool aInitial)
+	{
+	if (aInfo.iPriority<0 || aInfo.iPriority>63)
+		return KErrArgument;
+	if (aInfo.iPriority==0 && !aInitial)
+		return KErrArgument;
+	new (this) NThreadBase;
+	iStackBase=(TLinAddr)aInfo.iStackBase;
+	iStackSize=aInfo.iStackSize;
+	iTimeslice=(aInfo.iTimeslice>0)?aInfo.iTimeslice:-1;
+	iTime=iTimeslice;
+#ifdef _DEBUG
+	// When the crazy scheduler is active, refuse to set any priority higher than 1
+	if (KCrazySchedulerEnabled())
+		iPriority=TUint8(Min(1,aInfo.iPriority));
+	else
+#endif
+		{
+		iPriority=TUint8(aInfo.iPriority);
+		}
+	iHandlers = aInfo.iHandlers ? aInfo.iHandlers : &NThread_Default_Handlers;
+	iFastExecTable=aInfo.iFastExecTable?aInfo.iFastExecTable:&DefaultFastExecTable;
+	iSlowExecTable=(aInfo.iSlowExecTable?aInfo.iSlowExecTable:&DefaultSlowExecTable)->iEntries;
+	iSpare2=(TUint8)aInfo.iAttributes;		// iSpare2 is NThread attributes
+	if (aInitial)
+		{
+		iNState=EReady;
+		iSuspendCount=0;
+		TheScheduler.Add(this);
+		TheScheduler.iCurrentThread=this;
+		TheScheduler.iKernCSLocked=0;		// now that current thread is defined
+		}
+	else
+		{
+		iNState=ESuspended;
+		iSuspendCount=-1;
+		}
+	return KErrNone;
+	}
+
+void NThread_Default_State_Handler(NThread* __DEBUG_ONLY(aThread), TInt __DEBUG_ONLY(aOperation), TInt __DEBUG_ONLY(aParameter))
+	{
+	__KTRACE_OPT(KPANIC,DEBUGPRINT("Unknown NState %d: thread %T op %08x par %08x",aThread,aThread->iNState,aOperation,aParameter));
+	FAULT();
+	}
+
+void NThread_Default_Exception_Handler(TAny* aContext, NThread*)
+	{
+	ExcFault(aContext);
+	}
+
+
+/** Create a nanothread.
+
+	This function is intended to be used by the EPOC kernel and by personality
+	layers. A nanothread may not use most of the functions available to normal
+	Symbian OS threads. Use Kern::ThreadCreate() to create a Symbian OS thread.
+
+	@param aThread Pointer to control block for thread to create.
+	@param aInfo Information needed for creating the thread.
+
+	@see SNThreadCreateInfo
+	@see Kern::ThreadCreate
+
+	@pre	Call in a thread context.
+	@pre	Interrupts must be enabled.
+	@pre	Kernel must be unlocked.
+ */
+EXPORT_C TInt NKern::ThreadCreate(NThread* aThread, SNThreadCreateInfo& aInfo)
+	{
+	CHECK_PRECONDITIONS(MASK_KERNEL_UNLOCKED|MASK_INTERRUPTS_ENABLED|MASK_NOT_ISR|MASK_NOT_IDFC,"NKern::ThreadCreate");
+	return aThread->Create(aInfo,FALSE);
+	}
+
+// User-mode callbacks
+
+TUserModeCallback::TUserModeCallback(TUserModeCallbackFunc aFunc) :
+	iNext(KUserModeCallbackUnqueued),
+	iFunc(aFunc)
+	{
+	}
+
+TUserModeCallback::~TUserModeCallback()
+	{
+	__NK_ASSERT_DEBUG(iNext == KUserModeCallbackUnqueued);
+	}
+
+TInt NKern::QueueUserModeCallback(NThreadBase* aThread, TUserModeCallback* aCallback)
+	{
+	if (aCallback->iNext != KUserModeCallbackUnqueued)
+		return KErrInUse;
+	TInt r = KErrDied;
+	NKern::Lock();
+	TUserModeCallback* listHead = aThread->iUserModeCallbacks;
+	if (((TLinAddr)listHead & 3) == 0)
+		{
+		aCallback->iNext = listHead;
+		aThread->iUserModeCallbacks = aCallback;
+		r = KErrNone;
+		}
+	NKern::Unlock();
+	return r;
+	}
+
+// Called with interrupts disabled
+// The vast majority of times this is called with zero or one callback pending
+void NThreadBase::CallUserModeCallbacks()
+	{
+	while (iUserModeCallbacks != NULL)
+		{		
+		// Remove first callback
+		TUserModeCallback* callback = iUserModeCallbacks;
+		iUserModeCallbacks = callback->iNext;
+
+		// Enter critical section to ensure callback is called
+		NKern::ThreadEnterCS();
+		
+		// Re-enable interrupts and call callback
+		NKern::EnableAllInterrupts();
+		callback->iNext = KUserModeCallbackUnqueued;
+		callback->iFunc(callback, EUserModeCallbackRun);
+
+		// Leave critical section: thread may die at this point
+		NKern::ThreadLeaveCS();
+		
+		NKern::DisableAllInterrupts();
+		}
+	}
+
+void NKern::CancelUserModeCallbacks()
+	{
+	// Call any queued callbacks with the EUserModeCallbackCancel reason code, in the current
+	// thread.
+
+	NThreadBase* thread = NCurrentThread();
+	NKern::Lock();	
+	TUserModeCallback* listHead = thread->iUserModeCallbacks;
+	thread->iUserModeCallbacks = NULL;
+	NKern::Unlock();
+	
+	while (listHead != NULL)
+		{
+		TUserModeCallback* callback = listHead;
+		listHead = listHead->iNext;
+		callback->iNext = KUserModeCallbackUnqueued;
+		callback->iFunc(callback, EUserModeCallbackCancel);
+		}
+	}
+
+void NKern::MoveUserModeCallbacks(NThreadBase* aDestThread, NThreadBase* aSrcThread)
+	{
+	// Move all queued user-mode callbacks from the source thread to the destination thread, and
+	// prevent any more from being queued.  Used by the kernel thread code so that callbacks get
+	// cancelled in another thread if the thread they were originally queued on dies.
+
+	NKern::Lock();	
+	TUserModeCallback* sourceListStart = aSrcThread->iUserModeCallbacks;
+	aSrcThread->iUserModeCallbacks = (TUserModeCallback*)1;
+	NKern::Unlock();
+	__NK_ASSERT_DEBUG(((TUint)sourceListStart & 3) == 0);  // check this only gets called once per thread
+
+	if (sourceListStart == NULL)
+		return;
+
+	TUserModeCallback* sourceListEnd = sourceListStart;
+	while (sourceListEnd->iNext != NULL)
+		sourceListEnd = sourceListEnd->iNext;
+
+	NKern::Lock();
+	TUserModeCallback* destListStart = aDestThread->iUserModeCallbacks;
+	__NK_ASSERT_DEBUG(((TUint)destListStart & 3) == 0);
+	sourceListEnd->iNext = destListStart;
+	aDestThread->iUserModeCallbacks = sourceListStart;
+	NKern::Unlock();
+	}
+
+/** Initialise the null thread
+	@internalComponent
+*/
+void NKern::Init(NThread* aThread, SNThreadCreateInfo& aInfo)
+	{
+	aInfo.iFunction=NULL;			// irrelevant
+	aInfo.iPriority=0;				// null thread has lowest priority
+	aInfo.iTimeslice=0;				// null thread not timesliced
+	aInfo.iAttributes=0;			// null thread does not require implicit locks
+	aThread->Create(aInfo,TRUE);	// create the null thread
+	}
+
+extern "C" {
+TUint32 CrashState;
+}
+
+EXPORT_C TBool NKern::Crashed()
+	{
+	return CrashState!=0;
+	}
+
+
+/** @internalTechnology */
+EXPORT_C void NKern::RecordIntLatency(TInt /*aLatency*/, TInt /*aIntMask*/)
+	{
+	}
+
+
+/** @internalTechnology */
+EXPORT_C void NKern::RecordThreadLatency(TInt /*aLatency*/)
+	{
+	}
+
+/********************************************
+ * Deterministic Priority List Implementation
+ ********************************************/
+
+
+/** Construct a priority list with the specified number of priorities
+
+	@param aNumPriorities The number of priorities (must be 1-64).
+ */
+EXPORT_C TPriListBase::TPriListBase(TInt aNumPriorities)
+	{
+	memclr(this, sizeof(TPriListBase)+(aNumPriorities-1)*sizeof(SDblQueLink*) );
+	}
+
+
+/********************************************
+ * Miscellaneous
+ ********************************************/
+
+
+/**	Returns number of nanokernel timer ticks since system started.
+	@return tick count
+	@pre any context
+ */
+EXPORT_C TUint32 NKern::TickCount()
+	{
+	return NTickCount();
+	}
+
+
+TUint32 BTrace::BigTraceId = 0;
+
+TBool BTrace::DoOutBig(TUint32 a0, TUint32 a1, const TAny* aData, TInt aDataSize, TUint32 aContext, TUint32 aPc)
+	{
+	SBTraceData& traceData = BTraceData;
+
+	// see if trace is small enough to fit in single record...
+	if(TUint(aDataSize)<=TUint(KMaxBTraceDataArray+4))
+		{
+		a0 += aDataSize;
+		TUint32 a2 = 0;
+		TUint32 a3 = 0;
+		if(aDataSize)
+			{
+			a2 = *((TUint32*&)aData)++; // first 4 bytes into a2
+			if(aDataSize>=4 && aDataSize<=8)
+				a3 = *(TUint32*)aData; // only 4 more bytes, so pass by value, not pointer
+			else
+				a3 = (TUint32)aData;
+			}
+		return traceData.iHandler(a0,0,aContext,a1,a2,a3,0,aPc);
+		}
+
+	// adjust for header2, extra, and size word...
+	a0 |= BTrace::EHeader2Present<<(BTrace::EFlagsIndex*8)|BTrace::EExtraPresent<<(BTrace::EFlagsIndex*8);
+	a0 += 12;
+
+	TUint32 traceId = __e32_atomic_add_ord32(&BigTraceId, 1);
+	TUint32 header2 = BTrace::EMultipartFirst;
+	TInt offset = 0;
+	do
+		{
+		TUint32 size = aDataSize-offset;
+		if(size>KMaxBTraceDataArray)
+			size = KMaxBTraceDataArray;
+		else
+			header2 = BTrace::EMultipartLast;
+		if(size<=4)
+			*(TUint32*)&aData = *(TUint32*)aData; // 4 bytes or less are passed by value, not pointer
+
+		TBool result = traceData.iHandler(a0+size,header2,aContext,aDataSize,a1,(TUint32)aData,traceId,aPc);
+		if(!result)
+			return result;
+
+		offset += size;
+		*(TUint8**)&aData += size;
+
+		header2 = BTrace::EMultipartMiddle;
+		a1 = offset;
+		}
+	while(offset<aDataSize);
+
+	return TRUE;
+	}
+
+EXPORT_C TSpinLock* BTrace::LockPtr()
+	{
+	return 0;
+	}